Door-check.



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i i hun umm ,387. PATENTED AUG. 2, 1904.

0. C. RIXSON.

DOOR CHECK.

APPLICATION FILED JUNI; 7, 1901.

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No MODEL.

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O. C. RIXSON. y

DOOR CHECK.

APPLICATION FILED JUNE 7, 1901. n

3 SHEETS-SHEET s.

N0 MODEL.

UNITED STATES Patented August 2, 1904.

PATENT OFFICE.

OSCAR C. RIXSON, OF OAK PARK, ILLINOIS, ASSIGNOR TO THE OSCAR C. RIXSON CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 766,387, dated August 2, 1904.

Application filed June 7, 1901.

To all wiz/mt it may concern.-

Be it known that I, OSCAR C. RIxsoN, a citizen of the United States of America, residing at Oak Fark, Cook county, Illinois, have invented certain new and useful Improvements in Door-Checks, of which the following, taken in connection with the accompanying' drawing's, is a specilication.

My invention relates to means for closing and checking' the closure of doors; and its principal objects are, to provide such door closing and checking means as will be readily invertible to use with either a left hand or right hand door; to provide means by which the actuating spring' for closing the door operates in a direct line and by the same instrumentality as the checking device therefor; to provide a compact and self-contained means for actuating' the door and checking' it in its return motion; to provide superior means for using' a liquid checking' device, and to provide for entirely inclosing said liquid so as to relieve the joints of the higher pressure therein; to provide superior mechanism for carrying' out the functions, and to generally simplify and improve the structure of such devices, as will be hereinafter explained.

In order to obtain a better understanding of my invention reference may be had to the accompanying' drawings, in which in Fig. l I have shown in side elevation my improved door check applied to a door, and in Fig'. 2 I have shown a plan view of the checking' device, with the arms in normal position, when the door is closed, Fig'. 3 is a horizontal section through my improved checking' cylinder, with the parts in the position occupied when the door is closed, Fig. is a like section with the parts in the position occupied when the door is open, Fig.Y 5 is a vertical section taken on the line 5 of Fig'. I, Fig'. 6 is a section taken on the line 6 of Figs. l and 3, Fig'. T is a section taken on the line 7 of Fig'. 8, and Fig. 8 a view of adetail of the checking' piston device.

In carrying out my invention I provide first a shaft casing 9, to which is secured a spring' casing lO forming' also a checking' cylinder, the whole being secured to the door as shown Serial No. 63|664. (No model.)

vertical position with the spring casing pointing Vaway from the hinged side of the door. The shaft Il projects above and below the shaft casing 9, and is rotatably mounted or trunnioned therein as clearly shown in Fig. 5, and provided with suitable stufling boxes l2 to guard against leakage, and has square or irregular shaped ends I3, designed to form means of attachment for the arm 14, which is designed to swing in a holizontal plane, and has connected at its outer end l5, an extensible connection 16, which is anchored by means of an anchor piece I7, to the casing above the door in the position shown in Fig'. 2. The arm la will be secured to either one or the other end of the shaft Il, depending' upon whether the check is applied to a rig'ht or left hand door, the end not engaged by the arm I4 being' protected by means of a covering cap I8.

IVithin the shaft casing 9 the shaft 11 is provided with a bell crank projection 19, and an irregular shaped portion 20, about which it is intended to wrap or wind the flexible, or link connection 2l, which'has one end at 22 connected to the outer end of the bell crank I9, and the outer end at 23 connected to the checking pistonl 24, which operates within the checking cylinder l0, and is held against movement to the left by means of a closing' spring' 25, clearly shown in Figs. 3 aud 1I, and is provided with the ball valve 26 controlling' an opening' 27, which when open permits the passage of the checking l'luid from one side of the piston to the other, inthe opening of the door. The spring casing or checking' cylinder I0, is formed of pressed steel and screw threaded into the shaft casing' 9, as shown at 28, by which means I am enabled to construct a cylinder and spring' casing' in a single piece and of very thin pressed steel, requiring but little expense to manufacture, and not being' subject to leakage to the same extent as is cast iron or other like cast material because it is of less porous grain. I/Vithin the piston Q-l is another opening' 29, through which passes a tubular rod forming' a by-pass 30, the stem of which 3l, projects through a stufling the piston.

box 32, so that it can be adjusted from the outside to regulate the speed of closure of the door, the tubular opening 33 of the by-pass affording' the passage way for the checking' fluid when the door is nearly in closed position. T he extent of opening may be regulated by the distance of the end of the tube from the end of the cylinder. In order to eliminate all danger of leakage around the stem 31, the same is -arranged so as to control the passage of fluid from the pressure side of the piston to the nonpressure side while the stem is shielded at the same time from the pressure side. In other words the adjustable by-pass is so located that the adjusting stem thereof passes through the casing on the non-pressure side of The stem of the rod 3l is channeled or flattened as shown at 31, as a means of graduating the flow of liquid through the piston, the channel being gradually decreased in capacity toward the place over which the piston stands when the door is near closed position.

The flexible connection 21 is formed of three portions, 21, 2lb, and 21, all connected together by pivotal connections. The said several parts being so arranged that when the shaft ll is rotated by the opening of the door, they will wrap around the irregular portion thereof within the shaft casing, in the manner shown in F ig. 4, permitting the piston to be drawn the full length of its stroke within the checking cylinder, part of the cylinder space being occupied by the compressed spring. The entire apparatus takes up but little room. When the door starts to close the shaft rotates in the opposite direction, because of the expansion of the spring 25, and the parts of the connection 2l unwind, and come to a straight line position such as is shown in Fig. 3, at which point, as will be observed, there are provisions made for causing the said liexible connection to take a compression or checking strain, the part 2l*L and the part 2lb being' each provided with a squareden'd as shown, whereby it is made impossible for the parts to ex in a direction opposite to the direction shown when the door is open. Before reaching the extreme position at the right shown in Fig. 3, liexure of the connection 2l in a direction upward is prevented by means of the portion 24a of the piston 24, which also acts as a guide for the stem of the by-pass 30. By the peculiar arrangement of the shaft and connections shown, it is possible, with this device, to use a shaft capable of rotating through an angle of more than one hundred and eighty degrees and at the same time transmit force continuously in the same direction between the shaft and piston.

Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is

l. A door check comprising a checking cylinder, a checking piston therein, a shaft casing, a shaft mounted therein, a jointed connection between said shaft and the door casing and a connection from said shaft at a point within said shaft casing, to said piston, formed of a plurality of parts constructed so as to wrap about the shaft when the door is opened, and means whereby when the door is closed the said connection between the shaft and the piston acts to carry the compression or checking strain, substantially as described.

2. In door closing mechanism the combination of a casing and an actuating arm attached to the door, another actuating arm attached to the frame, a rotatable shaft mounted in the casing and attached to the iirst named arm, a cylinder extending from said casing and provided with a plunger therein having a spring mounted to directly thrust the plunger in one direction and means for checking its movements, a set of links connecting' said rotatable shaft directly with the plunger, whereby the rotation of the shaft reciprocates the plunger in both directions by means of said flexible links. I

3. In door closing mechanism the combination of a checking cylinder and a piston therein, a by-pass device comprising a graduated hollow stem for varying the escapement passing through the casing of the said cylinder on the non-pressure side of the piston, escapement being in the end of the hollow stem and regulated by the relative proximity of the end to the cylinder end wall.

4. rIhe combination with the liquid checking cylinder, and a piston therein, of a bypass device, comprising an opening through said piston, a rod extending through said opening, a passage controlled by the position of said rod relative to the end ofthe checking cylinder, and means for determining the position of such rod, substantially as described.

5. The combination with a liquid checking cylinder, and a piston therein, of a by-pass device, comprising an opening through said piston, and a hollow rod extending through said opening from the non-pressure side of the piston, said rod having' a channel formed therein of smaller capacity toward the end which projects through the piston opening and regulating the escapement by its position with respect to the cylinder wall, substantially as described.

6. In a door closing device the combination of a closed casing having a shaft therein provided with a crank arm, a checking cylinder extending from said casing and provided with liquid checking means therein, a plunger attached to said crank arm on the shaft by ilexible means capable of taking a thrust, and a coil spring in said cylinder on the opposite side from the liquid checking chamber, substantially as described.

7. In a doorclosing device, in combination with a closed cylinder containing liuid and a piston reciprocatingy therein, an 'escapement IOO IIO

for the [luid comprising a stationary tubular stein passing' through the piston, having' an opening' through its side and its end outlet placed in position to cooperate with the end wall of the easing to constrict the passage through the Stein, to reg'ulate the sarne, substantially as described` 8. In door closing' mechanism the combination with a closed casing having a checking' cylinder and being' provided with a shaft having' a crank arni therein, of a plunger in said cylinder and a series of flexible links designed to wind about the crank shaft on said spindle, said links being' provided with shoulders so that in the return motion they niay take the thrust upon the plunger to transmit it against the checking' liquid as the door is closed, substantially as described.

9. In a door closing and checking' device the combination with a closed cylinder containing a plunger, a link mechanism for directly moving' the same, a spring for operating the plunger in the other direction, and a regulator for the escapelnent of the checking' liquid, coniprising' a rod entirely inelosed in the chamber and extending through the back part of the same on the non-pressure side of the plunger, and provided with a graduated opening' therethrough to regulate the escapement of the checking fluid, the final escapenient through said hollow rod being' regulated bythe position of the rod with respect to the base of the cylinder, substantially as described.

PAUL CARPENTER, H. lV. SMALLEY. 

